﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class aaa
    {
        double p = 3.14;
        private double r;
        private int c;
        private int k;
        private int v;

      

        public int arr { get; set; }
        public double Yuan(double r){
            this.r = r;
            return p * (r * r);
        }
        public double Yuan(int c,int k)
        {
            return c*k;
        }

    }
}
